HP 6104A Service manual

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PRECISION

POWER

SUPPLIES

MODELS

61G4A,

6114A,

6105A,(6115A)

OPERATING

AND

SERVICE

MANUAL

FOR

SERIALS

1209A-00051

AND

ABOVE

*

*For

Serials

Above

1209A-00051

a

change

page

may

be

included.

Hewlett-Packard

Part

No.

5950-5976

Printed:

June,

19

72

TABLE

OF

CONTENTS

Section

Page

1

GENERAL

INFORMATION.1-1

1-1

Description.1-1

1-4

Models

6104A

and

6105A.-..

1-1

1-10

Models

6114A

and

6115A.

1

-1

1-16

Specifications.

1

-1

1-18

Options..

...

1-3

1-20

Accessories.1-4

1-22

Instrument

Identification.1-4

1-

25

Ordering

Additional

Manuals.1-4

2

INSTALLATION.

2

-1

2-

1

Initial

Inspection...2-1

2-3

Mechanical

Check..2-1

2-5

Electrical

Check..

..2-1

2-7

Repackaging

for

Shipment.2-1

2-9

Installation

Data....

2-1

2-11

Location

..2-1

2-13

Outline

Diagram.2-1

2-15

Rack

Mounting.2-1

2-17

Input

Power

Requirements...2-1

2-

20

Power

Cable

.

....2-2

3

OPERATING

INSTRUCTIONS.-.3-1

3-

1

Turn-On

Checkout

Procedures

.

...3-1

3-3

Operating

Modes...3-2

3-5

Normal

Operating

Mode.3-2

3-8

Constant

Voltage..3-2

3-10

Constant

Current....3-3

3-12

Overvoltage

Crowbar

Operation.3-3

3-17

Connecting

Load.3-4

3-21

Operation

Beyond

Normal

Rated

Output..

.

3-4

3-23

Remote

Programming,

Constant

Voltage.3-4

3-29

Remote

Programming,

Constant

Current.3-5

3-36

Remote

Sensing

(Figure

3-7)

.

.

■

..3-6

3-41

Series

Operation.3-7

3-43

Auto-Series

Operation

(Figure

3-9).3-7

3-47

Parallel

Operation.3-8

3-49

Auto-Parallel

Operation

(Figure

3-11).3-8

3-52

Auto-Tracking

Operation

(Figure

3-12).3-9

3-55

Special

Operating

Considerations.3-9

3-56

Pulse

Loading

.

..3-9

3-58

Output

Capacitance

..3-9

3-61

Reverse

Voltage

Loading.3-10

3-63

Reverse

Current

Loading.3-10

3-65

Gross

Current

Limit/Automatic

Dual-Range

Switching

•

.

.

.3-10

ii

1-1

DESCRIPTION

1-2

This

instruction

manual

contains

operating

and

service

instructions

for

four

Hewlett-Packard

precision

power

supplies.

The

four

models

(desig¬

nated

6104A,

6105A,

6114A,

and

6115A)

are

ideal

for

applications

requiring

an

accurate,

highly

stable,

and

easily

settable

source

of

dc

voltage

or

current.

All

models

are

completely

solid-state

and

feature

constant

voltage/constant

current

operation,

auto¬

matic

dual-range

operation,

overvoltage

crowbar

protection,

front-panel

voltage

and

current

meter¬

ing,

and

provisions

for

remote

voltage

and

current

programming.

In

addition,

all

models

are

capable

of

auto-series,

auto-parallel,

and

auto-tracking

operation.

Front-panel

mounted

controls

allow

current

limit

and

overvoltage

trip

points

to

be

con¬

veniently

set,

while

OVERVOLTAGE

and

CURRENT

MODE

light

emitting

diodes

indicate

when

the

cor¬

responding

condition

is

in

effect.

1-3

Additional

features

and

characteristics

appli¬

cable

to

specific

models

are

described

in

the

fol¬

lowing

paragraphs.

Section

III

of

this

manual

cov¬

ers

the

use

of

all

controls

and

indicators

and

gives

procedures

for

implementing

the

various

operating

modes.

1-4

MODELS

6104A

and

6105A

1-5

These

models

employ

individual

voltage

and

current

meters,

and

a

10-tum

potentiometer

for

setting

output

voltage

levels.

With

the

exception

of

some

component

values

and

meter

scale

mark¬

ings,

the

two

models

are

physically

identical.

For

improved

settability,

an

optional

three-digit

deca-

dial

voltage

control

(option

013)

is

available.

1-6

Model

6104A

Output

Ratings.

The

Model

6104A

can

be

operated

in

either

of

two

ranges:

0

to

20V

at

0

to

2A;

or

20

to

40V

at

0

to

1A.

Auto¬

matic

voltage

range

crossover

occurs

if

the

load

current

exceeds

approximately

1A

and

the

output

voltage

has

been

set

above

20V.

1-7

The

front

panel

CURRENT

control

allows

the

maximum

output

current

to

be

set

to

any

desired

value

from

0

amps

up

to

the

maximum

current

rating

for

the

range.

Using

this

control,

the

power

supply

can

be

operated

as

a

constant

current

source

with

0.01%

current

regulation.

The

front

panel

CURRENT

MODE

indicator

lights

when

either

the

maximum

(gross)

current

limit

is

reached,

or

when

the

current

limit

established

by

the

front

panel

control

is

reached.

When

the

indicator

is

lighted,

the

output

voltage

is

uncalibrated.

However,

the

front

panel

voltmeter

continues

to

indicate

the

output

voltage

with

an

accuracy

of

2%.

1-8

Model

61Q5A

Output

Ratings.

The

Model

6105A

can

be

operated

in

either

of

two

ranges:.

0

to

50V

at

0

to

0.

8A;

or

50

to

100V

at

0

to

0.

^A.

Automatic

voltage

range

crossover

occurs

if

the

load

current

exceeds

approximately

0.

4A

and

the

output

voltage

has

been

set

above

50V.

1-9

The

Model

6105A

can

also

be

used

as

a

cur¬

rent

source,

as

described

in

paragraph

1-7.

1-10

MODELS

6114A

and

6115A

1-11

These

models

make

use

of

a

front-panel

mounted

four-digit

pushbutton

control

to

increase

and

decrease

output

voltage

in

unit

steps.

A

thumbwheel

control

is

used

to

set

the

fifth

(or

least

significant)

digit

for

output

voltage

accuracy

in

the

fractional

millivolt

range.

A

single

meter,

combining

both

voltage

and

current

functions,

is

also

located

on

the

front

panel.

A

METER

slide

switch

selects

the

function

*o

be

indicated

on

the

meter.

With

the

exception

of

component

val¬

ues

and

meter

scale

markings,

the

6114A

and

6115A

are

physically

identical.

1-12

Model

6114A

Output

Ratings.

The

Model

6114A

can

be

operated

in

either

of

two

ranges:

0

to

20V

at

0

to

2A;

or

20

to

40V

at

0

to

1A.

Auto¬

matic

voltage

range

crossover

occurs

if

the

load

current

exceeds

approximately

1A

and

the

output

voltage

has

been

set

above

20V.

1-13

The

Model

6114A

can

also

be

used

as

a

cur¬

rent

source,

as

described

in

paragraph

1-7.

1-14

Model

6115A

Output

Ratings.

The

Model

6115A

can

be

operated

in

either

of

two

ranges:

0

to

50V

at

0

to

0,

8A;

or

50

to

100V

at

0

to

0.4A.

Automatic

voltage

range

crossover

occurs

if

the

load

current

exceeds

approximately

0.4A

and

the

output

voltage

has

been

set

above

50V.

1-15

The

Model

6115A

can

also

be

used

as

a

cur¬

rent

source,

as

described

in

paragraph

1-7.

1-16

SPECIFICATIONS

1-17

Detailed

specifications

for

all

four

models

are

given

in

Table

1-1.

1-1

Table

1-1.

Specifications,

Models

6104A,

6105A,

6114A,

6115A

NOTE

Specifications

apply

to

all

models,

unless

otherwise

indicated.

GENERAL

INPUT

POWER:

104-127

Vac,

48-440Hz,

15OVA

maximum

(Standard)

208-254

Vac,

48-440Hz,

150VA

maximum

(Switch

Selected)

DC

OUTPUT:

Single

output,

dual

range

with

automatic

cross¬

over

between

ranges.

Models

6104A

&

6114A:

0-20V,

2A/20-40V,

1A

Models

6105A

&

6115A~:

0-50V,

0.

8A/50-100V,

0.4A

METERS:

Models

6104A

and

61Q5A:

Individual

voltage

and

current

meters,

with

+2%

full

scale

accuracy.

Models

6114A

and

6115A:

Single,

dual-function

(voltage

and

current)

meter,

with

±2%

full

scale

accuracy.

TEMPERATURE

RATINGS:

Operating:

0

to

55°C.

Storage:

-40

to

+

75°C.

COOLING:

Convection

cooling

is

employed.

The

supplies

have

no

moving

parts.

DIMENSIONS:

See

outline

diagram.

Figure

2-1.

WEIGHT:

17

lbs.

(7,

7kg.)

net.

21

lbs.

(9,5kg.)

shipping.

TEMPERATURE

COEFFICIENT:

Output

voltage

change

per

degree

Centigrade

change

in

ambient

following

30-minute

warm

up.

Model

6104A:

0.005%+

25p.V

Model

6105A:

0.

005%

+

50uV

Model

6114A:

0.001%+

15^V

Model

6115A;

0.001%

+

15

|j.V

DRIFT:

Total

voltage

drift

over

8-hour

interval

under

constant

line,

load,

and

ambient

following

a

30-

minute

warm

up.

Conditions

must

be

held

con¬

stant

during

warm

up.

Models

6104A

&

6105A:

0.005%+

50pV

**

Models

6114A

&

6115A:

0.0015%+

15pV

*

TRANSIENT

RECOVERY

TIME;

Less

than

50|isec

is

required

for

output

voltage

recovery

to

within

lOmV

of

the

nominal

output

•voltage

following

a

change

in

output

current

equal

to

the

current

rating

of

the

supply.

OUTPUT

IMPEDANCE

(typical):

Equivalent

to

a

,

05mn.

resistor

in

series

with

a

3

pH

inductor,

RESOLUTION:

Minimum

output

voltage

change

obtainable

using

front

panel

voltage

controls.

Model

6104A:

8mV

Model

6114A

:

200pV

Model

6105A

:

16mV

Model

6115A

:

200pV

OUTPUT

VOLTAGE

ACCURACY:

0.025%+

lmV,

at

23°C±3°C,

at

any

line

vol.

and

load

cur.

within

rating,

after

5-min,

warm

up.

REMOTE

RESISTANCE

PROGRAMMING:

2000n/V

±

0.01%

Programming

Coefficient.

CONSTANT

VOLTAGE

OUTPUT

LOAD

REGULATION:

For

load

current

change

equal

to

current

rating

of

supply

(measured

at

rear

terminals).

Models

6I04A

&

6114A:

0.0005%+

100pV

Models

6105A

&

6115A:

0.0005%+

50pV

LINE

REGULATION:

For

a

±10%

change

in

line

voltage

from

nominal

value

(115

Vac

or

230

Vac),

Models

6104A

&

6114A:

0.0005%+

40pV

Models

6105A

&

6115A:

0.

0005%

+

100pV

RIPPLE

AND

NOISE:

40pVrms/l00|j.V

p-p

(up

to

20MHz)

at

any

line

voltage

and

under

any

load

condition

within

rating

REMOTE

VOLTAGE

PROGRAMMING:

Programming

Coefficient:

1V/V

Programming

Accuracy:

Accuracy

of

remote

source,

±

0.

2mV

REMOTE

PROGRAMMING

SPEED:

The

maximum

time

required

to

non-repetitively

program

from

0V

to

within

99.

9%

of

the

maximum

rated

output

voltage

(up

programming),

or

from

the

maximum

rated

output

voltage

to

within

0.

1%

of

that

voltage

above

0V

(down

programming).

61Q4A/6114A

up

prog.

down

prog.

'60msec

(no

load

,30msec

(full

load)

600msec

(no

load)

.30msec

(full

load)

6105A/6115A

150msec

(no

load)

75msec

(full

load)

1.

5sec

(no

load)

75msec

(full

load)

Table

1-1.

Specifications,

Models

6104A,

6105A,

6114A,

6115A

(continued)

OVERVOLTAGE

CROWBAR

PROTECTION:

Trip

Voltage

Range

(approximate):

0.

5V

to

10%

above

rated

output

voltage

of

supply.

Margin:

Minimum

2%

+

0.5V

above

output

volt¬

age

to

prevent

false

activation.

DC

OUTPUT

ISOLATION:

Supply

may

be

floated

at

up

to

300V

above

ground.

CONSTANT

CURRENT

OUTPUT

LOAD

REGULATION:

0.01%

+

500pA

for

load

voltage

change

equal

to

the

voltage

rating

of

the

supply.

LINE

REGULATION:

For

a

±10%

change

in

line

voltage

from

nominal

value

(115

Vac

or

230

Vac).

Models

6104A

&

6114A:

0.005%+

40

(

xA

Models

6105A

&

6115A;

0.

005%+

20pA

RIPPLE

AND

NOISE:

200pA

rms/lmA

p-p

at

any

line

voltage

and

under

any

load

condition

within

rating.

TEMPERATURE

COEFFICIENT:

Output

change

per

degree

Centigrade

change

in

ambient

following

30~minute

warm

up.

Models

6104A

&

6114A:

0.

02%

+

50pA

Models

6105A

&

6115A:

0.02%+

25pA

DRIFT:

Total

current

drift

in

output

over

8-hour

interval

under

constant

line,

load,

and

ambient

following

30-minute

warm

up.

Conditions

must

be

held

constant

during

warm

up.

Models

6104A

&

6114A:

0.25%

+

7mA

*

**

Models

6105A

&

6II5A:

0.25%

+

4mA

*

RESOLUTION:

Minimum

output

current

change

obtainable

using

front

panel

current

control.

Models

6104A

&

6114A:

15mA

Models

6105A

&

6115A:

8mA

REMOTE

RESISTANCE

PROGRAMMING:

Models

6104A

&

6114A:

500VA

±

0.

5%

Models

6105A

&

6115A:

1000

a/A

±

0.

25%

REMOTE

VOLTAGE

PROGRAMMING:

Models

6104A

&

6114A:

0.

5V/A

±

1%

Models

6105A

&

6115A:

1V/A

±

1%

*

Specified

with

final

decade

potentiometer

set

to

zero.

If

potentiometer

is

set

to

value

other

than

zero

thermally

induced

resistance

shifts

may

cause

drift

of

0.

0015%

+

200pV.

**

Potentiometer

wiper

jump

effect

may

add

5mV

(6104A)

or

lOmV

(6105A).

When

remote

program¬

med,

drift

is

0.001%

+

15pV

plus

stability

of

remote

programming

device.

^

When

remote

programmed,

drift

is

0.25%

+

500pA

plus

stability

of

remote

programming

device.

1-18

OPTIONS

1-19

Options

are

customer-requested

factory

mod¬

ifications

of

a

standard

instrument.

All

of

the

op¬

tions

described

below

apply

to

Models

6104A

and

6105A.

All

except

option

013

apply

to

Models

6114A

and

6115A.

Option

No.

Description

008

Ten-turn

Output

Current-Control:

Replaces

standard

single-turn

cur¬

rent

control

to

allow

greater

resol¬

ution

in

setting

the

output

current

of

supply.

013

Three

Digit

Graduated

Decadial

Vol¬

tage

Control:

Replaces

standard

10-tum

voltage

control

of

Models

6104A

and

6105A

for

improved

output

voltage

settabil-

ity.

Option

No.

Description

014

Three

Digit

Graduated

Decadial

Cur

¬

rent

Control:

Includes

10-tum

control,

replacing

standard

single-turn

current

control

for

greater

resolution

in

setting

the

output

current

of

supply.

040

Interfacing

for

Multiprogrammer

Oper

¬

ation:

Prepares

standard

HP

power

supplies

for

resistance

programming

by

the

6940A

Multiprogrammer

or

6941A

Multiprogrammer

Extender.

Operation

with

either

of

these

instruments

re¬

quires

that

the

powe

r

supply

be

sub¬

jected

to

(1)

Special

Calibration,

and

(2)

Protection

Checkout.

The

former

procedure

insures

that

the

power

sup¬

ply

can

be

accurately

set

to

zero

and

the

maximum

rated

output

voltage

or

current

when

programmed

by

the

Multiprogrammer;

the

latter

pro¬

cedure

insures

that

the

power

sup¬

ply

will

not

be

damaged

by

the

rapid,

repetitive

programming

pos¬

sible

with

the

Multiprogrammer.

1-21

The

accessories

listed

in

the

following

chart

may

be

ordered

with

the

instrument

or

separately

from

your

local

Hewlett-Packard

sales

office

(refer

to

list

at

rear

of

manual

for

addresses).

HP

Part

No.

Description

5060-8762

Dual

Rack

Adapter:

Kit

for

rack

mounting

one

or

two

supplies

in

standard

19-inch

rack.

5060-8760

Blank

Panel:

Filler

panel

to

block

unused

half

of

rack

when

mounting

only

one

supply.

1052A

Combining

Case

for

mounting

one

or

two

units

in

standard

19''

rack.

5060-0789

Cooling

kit

for

above

combining

case,

115Vac,

50-60HZ.

5060-0796

Cooling

kit

for

above

combining

case,

230Vac,

50-60Hz.

1-22

INSTRUMENT

IDENTIFICATION

1-23

Hewlett-Packard

power

supplies

are

identif¬

ied

by

a

three-part

serial

number.

The

first

part

is

the

power

supply

model

number.

The

second

part

is

the

serial

number

prefix,

consisting

of

a

number-letter

combination

denoting

the

date

of

a

significant

design

change

and

the

country

of

man¬

ufacture.

The

first

two

digits

indicate

the

year

(12

=

1972,

13

=

1973,

20

=

1980,

etc);

the

sec¬

ond

two

digits

indicate

the

week

(01

through

52);

and

the

letter

"A",

"G",

"

J",

or

"U"

designates

the

U.S.

A.

,

West

Germany,

Japan,

or

the

United

Kingdom,

respectively,

as

the

country

of

manufac¬

ture.

The

third

part

is

the

power

supply

serial

number;

a

different

5-digit

sequential

number

is

assigned

to

each

power

supply,

starting

with

00101.

1-24

If

the

serial

number

prefix

on

your

unit

does

not

agree

with

the

prefix

on

the

title

page

of

this

manual,

change

sheets

supplied

with

the

manual

or

manual

backdating

changes

in

Appendix

A

define

the

differences

between

your

instrument

and

the

instrument

described

by

this

manual.

1-26

One

manual

is

shipped

with

each

instrument.

Additional

manuals

may

be

purchased

from

your

local

Hewlett-Packard

field

office

(see

list

at

rear

of

this

manual-for

addresses).

Specify

the

model

number,

serial

number

prefix,

and

HP

part

number

shown

on

the

title

page.

1-4

SECTION

H

INSTALLATION

24

INITIAL

INSPECTION

2-2

Before

shipment,

this

instrument

was

in¬

spected

and

found

to

be

free

of

mechanical

and

electrical

defects.

As

soon

as

the

instrument

is

received,

proceed

as

instructed

in

the

following

paragraphs.

2-3

MECHANICAL

CHECK.

2-4

If

external

damage

to

the

shipping

carton

is

evident,

ask

the

carrier's

agent

to

be

present

when

the

instrument

is

unpacked.

Check

the

in¬

strument

for

external

damage

such

as

broken

con¬

trols

or

connectors,

and

dents

or

scratches

on

the

panel

surfaces.

If

the

instrument

is

damaged,

file

a

claim

with

the

carrier's

agent

and

notify

your

local

Hewlett-Packard

Sales

and

Service

Office

as

soon

as

possible

(see

list

at

rear

of

this

manual

for

addresses).

2-5

ELECTRICAL

CHECK

2-6

Check

the

electrical

performance

of

the

in¬

strument

as

soon

as

possible

after

receipt.

Sec¬

tion

V

of

this

manual

contains

performance

check

procedures

which

will

verify

instrument

operation

within

the

specifications

stated

in

Table

1-1.

This

check

is

also

suitable

for

incoming

quality

control

inspection.

Refer

to

the

inside

front

cover

of

the

manual

for

the

Certification

and

Warranty

state¬

ments.

21

REPACKAGING

FOR

SHIPMENT

2-8

To

insure

safe

shipment

of

the

instrument,

it

is

recommended

that

the

package

designed

for

the

instrument

be

used.

The

original

packaging

mater¬

ial

is

reusable.

If

it

is

not

available,

contact

your

local

Hewlett-Packard

field

office

to

obtain

the

materials.

This

office

will

also

furnish

the

address

of

the

nearest

service

office

to

which

the

instrument

can

be

shipped.

Be

sure

to

attach

a

tag

to

the

instrument

specifying

the

owner,

model

number,

full

serial

number,

and

service

required,

or

a

brief

description

of

the

trouble.

2-9

INSTALLATION

DATA

2-10

The

instrument

is

shipped

ready

for

bench

operation.

It

is

necessary

only

to

connect

the

in¬

strument

to

a

source

of

power

and

it

is

ready

for

operation.

2-11

LOCATION

2-12

This

instrument

is

convection

cooled.

Suf¬

ficient

space

should

be

allotted

so

that

a

free

flow

of

cooling

air

can

reach

the

top

and

rear

of

the

in¬

strument

when

it

is

in

operation.

It

should

be

used

in

an

area

where

the

ambient

temperature

remains

between

0°C

and

+55°C.

2-13

OUTLINE

DIAGRAM

2-14

Figure

2-1

illustrates

the

outline

shape

and

dimensions

of

Models

6104A,

6105A,

6114A,

and

6115A.

Figure

2-1.

Outline

Diagram

2-15

RACK

MOUNTING

2-16

The

Model

6104A,

6105A,

6114A,

and

611SA

power

supplies

may

be

rack

mounted

using

either

the

dual

rack

adapter

kit

or

the

combining

case

(with

appropriate

cooling

kit)

described

in

para¬

graph

1-20.

The

necessary

installation

instruct¬

ions

are

provided

with

the

accessories.

247

INPUT

POWER

REQUIREMENTS

2-18

Models

6104A,

6105A,

6114A,

and

6115A

may

be

operated

continuously

from

either

a

nominal

120

volt

or

240

volt,

48-440Hz

power

source.

A

two-

position

selector

switch

(f)

located

within

the

a-c

power

module

on

the

rear

panel

selects

the

power

source.

Before

connecting

the

instrument

to

2-20

POWER

CABLE

the

power

source,

check

that

the

selector

switch

setting

matches

the

nominal

line

voltage

of

the

source.

If

required,

move

the

switch

to

the

other

position.

Note

that

the

power

cable

must

be

re¬

moved,

the

plastic

door

on

the

power

module

must

be

moved

aside,

the

fuse

extractor

must

be

pulled

outward

and

the

fuse

must

be

removed

in

order

to

gain

access

to

the

selector

switch.

2-19

When

the

instrument

leaves

the

factory,

the

proper

fuse

is

installed

for

115

volt

operation.

An

envelope

containing

a

fuse

for

230

volt

opera¬

tion

is

attached

to

the

instrument.

Make

sure

that

the

correct

fuse

is

installed

if

the

position

of

the

slide

switch

is

changed

(2A

for

115

volt

opera¬

tion,

and

1A

for

230

volt

operation).

2-21

To

protect

operating

personnel,

the

National

Electrical

Manufacturers'

Association

(NEMA)

rec¬

ommends

that

the

instrument

panel

and

cabinet

be

grounded.

This

instrument

is

equipped

with

a

three

conductor

power

cable.

The

third

conductor

is

the

ground

conductor

and

when

the

cable

is

plugged

in¬

to

an

appropriate

receptacle,

the

instrument

is

grounded.

The

offset

pin

on

the

power

cable's

three-

prong

connector

is

the

ground

connection.

2-22

To

preserve

the

protection

feature

when

oper¬

ating

the

instrument

from

a

two-contact

outlet,

use

a

three-prong

to

two-prong

adapter

and

connect

the

green

lead

on

the

adapter

to

ground.

Figure

3-1.

Operating

Controls

and

Indicators

3-1

TURN-ON

CHECKOUT

PROCEDURES

3-2

The

following

checkout

procedure

describes

the

use

of

the

front

panel

controls

and

indicators

(Figure

3-1)

for

either

the

dual

meter,

ten-turn

VOLTAGE

control

supplies

(the

6104A

or

6105A)

or

the

single

meter,

pushbutton

VOLTAGE

control

supplies

(the

6114A

or

6115A).

The

checkout

pro¬

cedures

ensure

that

the

power

supply

is

operation¬

al.

a.

For

the

6114A/6115A,

set

meter

switch

©

to

VOLTS

(there

is

no

meter

switch

on

the

6104A

or

6105A).

b.

Rotate

OVERVOLTAGE

(crowbar)

control

©

(screwdriver

adjust)

fully

clockwise;

and

ro¬

tate

CURRENT

control

©

to

middle

of

range.

c.

Set

LINE

switch

©

to

ON

and

observe

that

indicator

©

lights.

d.

Adjust

VOLTAGE

control

©

through

the

entire

output

voltage

range

as

indicated

on

meter.

©

Adjust

output

for

desired

operating

voltage

NOTE

To

increase

the

6114A/6115A

output

vol¬

tage,

depress

the

pushbutton

switch

a-

bove

the

associated

digit.

To

decrease

the

voltage,

depress

the

pushbutton

switch

below

the

associated

digit.

Fine

output

voltage

adjustment

is

provided

by

the

millivolt

digit

thumbwheel

potentio¬

meter.

e.

To

ensure

that

the

overvoltage

crowbar

circuit

is

operational,

rotate

the

OVERVOLTAGE

con¬

trol

counterclockwise

until

the

supply

crowbars.

Output

voltage

will

fall

to

approximately

one

volt

and

the

OVERVOLTAGE

and

CURRENT

MODE

indica¬

tors

(

(|)

and

(|)

,

respectively)

will

light.

/f.

To

deactivate

the

crowbar,

return

the

OVERVOLTAGE

control

to

maximum

clockwise

posi¬

tion

and

turn

off

supply.

Turn

supply

back

on

and

output

voltage

should

again

be

value

obtained

in

step

(d),

g.

To

checkout

the

constant

current

circuit,

first

turn

off

supply.

Short

circuit

front

panel

output

terminals

(+

to

-).

On

the

6114A

or

6.115A

supplies

set

meter

switch

to

AMPS.

Turn

on

the

supply;

CURRENT

MODE

indicator

(?)

comes

on.

h.

Adjust

CURRENT

control

through

the

en¬

tire

output

current

range

as

indicated

on

meter.

Adjust

output

for

desired

operating

current.

i.

Remove

short

and

connect

load

to

output

terminals.

Note

that

for

maximum

load

protection

by

the

crowbar,

the

Load

should

be

connected

to

the

rear

terminals.

NOTE

The

power

supply

features

automatic

dual-range

operation.

If

operating

voltage

and

current

are

both

set

above

the

mid-points

of

supply's

voltage

and

current

ratings,

the

supply

will

gross

current

limit

if

current

attempts

to

ex¬

ceed

one-half

the

maximum

current

rating

of

the

supply.

If

output

current

increases

further,

the

supply

enters

the

constant

current

mode

in

which

output

voltage

is

reduced

in

order

to

supply

the

desired

current.

The

VOLT¬

AGE

control

setting,

therefore,

is

overridden.

See

paragraph

3-65

for

more

details.

3-3

OPERATING

MODES

3-4

The

power

supply

is

designed

so

that

its

mode

of

operation

can

be

selected

by

making

strap¬

ping

connections

between

particular

terminals

on

the

terminal

strips

at

the

rear

of

the

power

supply.

The

terminal

designations

are

stenciled

on

the

power

supply

above

their

respective

terminals.

The

operator

can

ground

either

the

positive

or

negative

terminal

or

operate

the

power

supply

up

to

3

00Vdc

off

ground

(floating).

The

following

paragraphs

des¬

cribe

the

procedures

for

utilizing

the

various

oper¬

ational

capabilities

of

the

power

supply.

A

more

theoretical

description

concerning

the

operational

features

of

this

supply

is

contained

in

Application

Note

90

and

in

various

Tech.

Letters.

Copies

of

these

can

be

obtained

from

your

local

Hewlett-

Packard

field

office.

3-6

The

power

supply

is

normally

shipped

with

its

rear

terminal

strapping

connections

arranged

for

constant

Voltage/Constant

Current,

local

sensing,

local

programming,

single

unit

mode

of

operation.

This

strapping

pattern

is

illustrated

in

Figure

3-2.

3-7

The

operator

selects

either

a

constant

voltage

or

a

constant

current

output

using

the

front

panel

controls

(for

local

programming,

no

strapping

changes

are

necessary).

Each

supply

is

rated

for

two

voltage

and

current

ranges

as

follows:

Model

Low

Range

High

Range

Voltage

Current

Voltage

Current

6104A/61I4A

6105A/6115A

0-20V

0-50V

0-2A

0-.

8A

20-

40V

50-100V

0-1A

0-.4A

When

the

VOLTAGE

and

CURRENT

settings

are

with¬

in

the

specified

ranges,

the

constant

voltage

and

constant

current

modes

of

operation

are

selected

as

described

below.

If,

however,

VOLTAGE

and

CUR¬

RENT

settings

are

required

that

are

outside

of

the

specified

ranges

for

normal

operation

(for

instance,

the

6104A

is

set

for

30V

and

1.

5A),

the

power

sup¬

ply

provides

automatic

dual-range

switching

if

output

current

attempts

to

exceed

the

low

range

cur¬

rent

rating.

As

current

is

limited

(to

approximately

65%

of

the

maximum,

low

range,

rating

at

nominal

line

voltage),

the

VOLTAGE

setting

is

overridden

and

output

voltage

is

reduced

to

the

low

range

(approximately

65%

of

the

maximum,

high

range,

voltage

rating

at

nominal

line

voltage).

The

supply

next

enters

the

constant

current

mode

during

which

output

voltage

is

reduced

in

order

to

supply

the

de¬

sired

current.

Refer

to

paragraph

3-65

for

more

in¬

formation

on

how

the

supply

operates

to

gross

cur¬

rent

limit

and

automatically

switch

ranges,

3-8

CONSTANT

VOLTAGE

3-9

To

select

a

constant

voltage

output,

within

the

normal

range

ratings

of

the

supply,

proceed

as

follows;

.

a.

Remove

load

from

output

terminals;

turn¬

on

supply

and

adjust

VOLTAGE

control

for

desired